For customers in the USA:

http://esupport.sony.com/

For customers in Canada:

http://esupport.sony.com/CA/

For customers in Latin America:

http://esupport.sony.com/LA

For customers in Europe:

http://support.sony-europe.com/

For customers in Australia:

http://www.sony-asia.com/support

For customers in India:

http://www.sony.co.in/section/support